A notice of leave. Can be used in verbal or online conversation. Derived from a misunderstood statement in the dialoge between Carmella and Tony in HBO's, "The Sopranos". "alamoo" may be added for extra confusion of the alterior conversationalist.

boozigaman6: Devon want to come over and help me with some stuff? Just for like an hour.
Devoniarelli888: gabagoo alamoo
bozigaman6: what? no wait! what are you talking about!?
Devoniarelli888 signed off at 8:04 pm